Texas Instruments AMC1203DWR

Overview

AMC1203 from Texas Instruments is a precision, basic-isolated delta-sigma modulator optimized for shunt-based current sensing in high-noise industrial power systems. It features ±280mV linear input range, 10MHz internal clock, ±1mV max offset error, ±2% max gain error, and 3500V_PEAK isolation per VDE 0884-17 - enabling direct connection to motor drive shunt resistors with high common-mode rejection.

For engineers reviewing the AMC1203 datasheet, AMC1203 pinout, AMC1203 application, or AMC1203 equivalent, this page delivers verified specifications, SOP-8 (DUB) and SOIC-16 (DW) package mapping, real-world timing interface behavior, and validated alternatives for isolated current measurement in motor control and UPS designs.

Technical Context

The AMC1203 implements a second-order switched-capacitor delta-sigma modulator with SiO₂ capacitive isolation barrier, delivering a 1-bit bitstream synchronized to its internally generated 10MHz clock (±2MHz tolerance). Its differential analog front-end exhibits 28kΩ dynamic input resistance and supports common-mode voltages from 0V to AVDD.

Digital output (DOUT) and clock (CLKOUT) operate on separate low-side domains (DVDD/DGND), while analog inputs (INP/INN) and supply (AVDD/AGND) reside on the high-side domain. CMTI is rated ≥15kV/µs, and CMRR reaches 105dB at 10kHz - critical for accurate current reconstruction in fast-switching inverters.

Key Specifications

Pinout & Package

AMC1203 is available in three packages: SOP-8 gull-wing (DUB), SOP-8 (PSA), and SOIC-16 (DW). This entry corresponds to the DUB variant - an 8-pin gull-wing surface-mount package (9.5mm × 10.4mm) with creepage/clearance ≥7mm and reinforced insulation barrier.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated delta-sigma modulator applications.

Compared with AMC1303M0510 and ISO224, the AMC1203 offers optimal balance of cost, integration (internal clock), and direct ±280mV compatibility for mainstream industrial motor drives - avoiding gain stage design overhead while maintaining robust 15kV/µs transient immunity.

Availability

AMC1203 is available at Aetrix Electronics and suitable for industrial motor drives, frequency inverters, and uninterruptible power supplies requiring stable component supply across extended temperature and high-reliability isolation performance.

Supply support for AMC1203 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability power management solutions for industrial, automotive, and communications markets.

The AMC1203 belongs to TI's precision isolated delta-sigma modulator product line, designed specifically for high-accuracy, high-CMTI current sensing in motor control, energy conversion, and power supply feedback loops.

FAQ

What is the maximum recommended operating temperature for the AMC1203?

The AMC1203 is fully specified over an ambient temperature range of –40°C to +105°C. Its electrical characteristics-including offset error (±1mV max), gain error (±2% max), and CMTI (≥15kV/µs)-are guaranteed across this range. Thermal derating is not required up to +105°C ambient when mounted on a standard FR-4 PCB with recommended copper pour and decoupling.

Does the AMC1203 require an external clock source?

No, the AMC1203 does not require an external clock source. It integrates a 10MHz ±2MHz internal clock generator, and the CLKOUT pin provides this clock directly to the host processor or digital filter. This eliminates timing jitter from external sources and simplifies PCB layout by removing clock trace routing across the isolation barrier.

Can the AMC1203 be used with a microcontroller lacking a sinc3 filter?

Yes, the AMC1203 can be used with MCUs lacking hardware sinc3 filters. Its 1-bit DOUT bitstream may be processed in firmware using a software-based sinc3 algorithm, or interfaced with FPGAs implementing custom decimation logic. However, real-time performance and CPU load must be evaluated - TI C2000™ devices with SDFM provide optimal latency and resource efficiency for AMC1203.

What isolation certifications does the AMC1203 hold?

The AMC1203 is certified to DIN EN IEC 60747-17 (VDE 0884-17) for 3500V_PEAK basic isolation and UL1577 for 2500V_RMS withstand voltage (1 minute). These certifications validate its suitability for reinforced insulation in functional safety applications up to Industrial Safety Integrity Level (SIL) 2, when implemented per TI's safety manual.

How does the AMC1203 handle common-mode transients?

The AMC1203 achieves ≥15kV/µs common-mode transient immunity (CMTI) via its SiO₂ capacitive isolation barrier and differential input architecture. This allows it to maintain valid DOUT bitstream output during rapid bus voltage transitions-such as those occurring during IGBT turn-off in 690VAC drives-without corruption or latch-up, ensuring continuous current loop stability.